This project creates a smart feeding reminder for your aquarium. When you approach the fish tank, the system checks if it is time to feed and plays a voice reminder if needed. It also tracks the last feeding time and prevents overfeeding.<\/p>\n
Difficulty:<\/strong> Beginner A PIR sensor detects when someone approaches the fish tank. The ESP32 checks the current time against a feeding schedule. If it is within the feeding window and the last feeding was more than 8 hours ago, it plays a voice reminder. A button can be pressed to mark feeding as done.<\/p>\n OUT<\/th>\n GPIO 4<\/th>\n –<\/th>\n GPIO 16<\/th>\n –<\/th>\n GPIO 17<\/th>\n One side<\/th>\n GPIO 5<\/th>\n Anode<\/th>\n GPIO 2<\/th>\n Anode<\/th>\n GPIO 15<\/th>\n<\/tbody>\n \u8868<\/p>\n This fish tank feeding reminder ensures your aquatic pets are fed on schedule with voice reminders.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a smart feeding reminder for your aquarium. When you approach the fish tank, the system checks if it is time to feed and plays a voice reminder if needed. It also tracks the last feeding time and prevents overfeeding. Difficulty: Beginner Estimated time: 1-2 hours Estimated cost: $20-30 How It […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-4143","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 1-2 hours
\nEstimated cost:<\/strong> $20-30<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Circuit Diagram<\/h2>\n
Connection Table<\/h3>\n
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Component<\/th>\n Pin<\/th>\n ESP32 Pin<\/th>\n<\/thead>\n \nPIR Sensor<\/th>\n DFPlayer Mini TX<\/th>\n DFPlayer Mini RX<\/th>\n Push Button<\/th>\n Green LED<\/th>\n Red LED<\/th>\n Arduino Code<\/h2>\n
\/\/ Fish Tank Feeding Reminder\n#include <WiFi.h>\n#include <SoftwareSerial.h>\n#include <DFRobotDFPlayerMini.h>\n#include <time.h>\n\nSoftwareSerial mySoftwareSerial(16, 17);\nDFRobotDFPlayerMini myDFPlayer;\n\nconst int pirPin = 4;\nconst int buttonPin = 5;\nconst int greenLedPin = 2;\nconst int redLedPin = 15;\n\nconst char* ntpServer = \"pool.ntp.org\";\nconst long gmtOffset = 0;\nconst int daylightOffset = 0;\n\nstruct FeedingTime {\n int hour;\n int minute;\n};\n\nFeedingTime feedTimes[] = {{8, 0}, {18, 0}};\nconst int numFeedTimes = 2;\n\nunsigned long lastFeedTime = 0;\nbool fedToday[2] = {false, false};\nunsigned long lastReminderTime = 0;\nconst unsigned long reminderCooldown = 3600000;\n\nvoid setup() {\n Serial.begin(115200);\n \n pinMode(pirPin, INPUT);\n pinMode(buttonPin, INPUT_PULLUP);\n pinMode(greenLedPin, OUTPUT);\n pinMode(redLedPin, OUTPUT);\n \n digitalWrite(greenLedPin, LOW);\n digitalWrite(redLedPin, LOW);\n \n WiFi.begin(\"YourSSID\", \"YourPassword\");\n while (WiFi.status() != WL_CONNECTED) delay(500);\n configTime(gmtOffset, daylightOffset, ntpServer);\n \n mySoftwareSerial.begin(9600);\n myDFPlayer.begin(mySoftwareSerial);\n myDFPlayer.volume(20);\n \n delay(30000);\n}\n\nbool isTimeToFeed(int currentHour, int currentMinute, int feedHour, int feedMinute) {\n int currentMinutes = currentHour * 60 + currentMinute;\n int feedMinutes = feedHour * 60 + feedMinute;\n return (currentMinutes >= feedMinutes && currentMinutes < feedMinutes + 30);\n}\n\nvoid markFed(int feedIndex) {\n fedToday[feedIndex] = true;\n lastFeedTime = millis();\n digitalWrite(greenLedPin, HIGH);\n myDFPlayer.play(3);\n delay(2000);\n digitalWrite(greenLedPin, LOW);\n}\n\nvoid playReminder(int feedIndex) {\n myDFPlayer.play(feedIndex == 0 ? 1 : 2);\n digitalWrite(redLedPin, HIGH);\n delay(2000);\n digitalWrite(redLedPin, LOW);\n}\n\nvoid resetDaily() {\n struct tm timeinfo;\n if (getLocalTime(&timeinfo)) {\n if (timeinfo.tm_hour == 0 && timeinfo.tm_min == 0) {\n for (int i = 0; i < numFeedTimes; i++) fedToday[i] = false;\n }\n }\n}\n\nvoid loop() {\n struct tm timeinfo;\n if (!getLocalTime(&timeinfo)) return;\n \n resetDaily();\n \n bool motion = digitalRead(pirPin) == HIGH;\n bool buttonPressed = digitalRead(buttonPin) == LOW;\n \n if (buttonPressed) {\n delay(50);\n if (digitalRead(buttonPin) == LOW) {\n for (int i = 0; i < numFeedTimes; i++) {\n if (isTimeToFeed(timeinfo.tm_hour, timeinfo.tm_min, feedTimes[i].hour, feedTimes[i].minute)) {\n markFed(i);\n break;\n }\n }\n while (digitalRead(buttonPin) == LOW) delay(10);\n }\n }\n \n if (motion && (millis() - lastReminderTime > reminderCooldown)) {\n for (int i = 0; i < numFeedTimes; i++) {\n if (isTimeToFeed(timeinfo.tm_hour, timeinfo.tm_min, feedTimes[i].hour, feedTimes[i].minute) && !fedToday[i]) {\n lastReminderTime = millis();\n playReminder(i);\n break;\n }\n }\n }\n \n delay(100);\n}\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Conclusion<\/h2>\n